For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
The machine has no signs of liquid damage. USB meter shows 5V 0.16A. PPBUS is 12.3V. PP3V8_AON is present. The main PMU (U8100) does not produce any power rails, it appears to be off despite good input power. What signals are required to turn it on?